EP1082711B1 - Feuchtigkeitssensor - Google Patents

Feuchtigkeitssensor Download PDF

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Publication number
EP1082711B1
EP1082711B1 EP99955355A EP99955355A EP1082711B1 EP 1082711 B1 EP1082711 B1 EP 1082711B1 EP 99955355 A EP99955355 A EP 99955355A EP 99955355 A EP99955355 A EP 99955355A EP 1082711 B1 EP1082711 B1 EP 1082711B1
Authority
EP
European Patent Office
Prior art keywords
moisture
detector
unit
detector unit
detector according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP99955355A
Other languages
English (en)
French (fr)
Other versions
EP1082711A1 (de
Inventor
Paul Kimsey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9811779.9A external-priority patent/GB9811779D0/en
Application filed by Individual filed Critical Individual
Publication of EP1082711A1 publication Critical patent/EP1082711A1/de
Application granted granted Critical
Publication of EP1082711B1 publication Critical patent/EP1082711B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm

Definitions

  • This invention relates to a moisture detector, particularly, but not exclusively, for detecting urine.
  • the present invention seeks to provide a new and inventive form of moisture detector.
  • the present invention proposes a moisture detector comprising a detector unit which is arranged to operate a remote alarm via a wire-less link when moisture is present, and the detector unit is powered by electrical charge stored in capacitor means.
  • the capacitor means may comprise a single capacitor or a bank of capacitors.
  • the equipment comprises three separate units, namely a detector unit (Fig. 1) to be placed in a babies nappy, a receiver unit (Fig. 3) carried by an adult (normally the baby's mother), and a charger unit (Fig. 5) for re-charging the detector unit as necessary.
  • a detector unit Fig. 1 to be placed in a babies nappy
  • a receiver unit Fig. 3 carried by an adult (normally the baby's mother)
  • a charger unit Fig. 5
  • the detector unit 1 has a soft encapsulating sealed moisture-proof outer case 2 of a soft and flexible material such as latex rubber, silicone rubber or plastic, which encloses the electronic circuitry to prevent contact with urine.
  • the electronics are further encapsulated in resin within the case 2 to provide mechanical protection.
  • Two electrodes 3 and 4 of corrosion-resistant metal are exposed on the external surface of the case 2, which serve a dual function of moisture sensors and providing contacts via which the detector unit can be re-charged.
  • the sensor electrodes When placed in the nappy the sensor electrodes are placed in contact the moisture-absorbent material of the nappy, but preferably not in contact with the baby's skin to prevent normal skin moisture from triggering the unit. In any event it is preferable to set the detection threshold such that the unit is not triggered by normal skin contact.
  • the electronics is powered from a rechargeable capacitor 10 comprising thin conductive layers separated by a thin layer of an electrical insulating material.
  • a tantalum or electrolytic capacitor may be used, e.g. of wet type double layer electrolytic construction, having a value from serval thousand microfarads up to several farads.
  • a detector circuit 11 monitors the electrical impedance between the electrodes 3 and 4 and signals a microprocessor-based code generator 12 when the impedance falls below a predetermined threshold due to presence of moisture. Upon receiving the signal from the detector 11 the generator 12 activates a high frequency radio transmitter 13 which transmits the code by frequency modulation via an aerial 14, also enclosed within the case 2.
  • the detector 11, generator 12 and transmitter 14 employ CMOS technology so that the circuit is of a high supply impedance and therefore draws a very low current from the capacitor 10. By using high impedance electronics the current consumption can be reduced sufficiently to allow the device to operate for more than an hour without recharging.
  • the transmitter 14 only generates a few microwatts of radio frequency power, but this is sufficient to be detected over a distance of about 50 metres.
  • the use of a capacitor has several advantages. Firstly, it eliminates corrosive and/or toxic substances which are widely used in batteries. Secondly, a capacitor does not suffer from memory problems associated with the use of rechargeable batteries which reduces their storage capacity, so that the service life of the unit is considerably increased. Thirdly, a capacitor can be fully charged in a matter of seconds, much less than the time normally taken to change a nappy. The unit can therefore be used without interruption and no battery changing is necessary.
  • the capacitor power source 10 is provided with a charge monitor circuit which signals the microprocessor 12 when the capacitor voltage falls below a predetermined level.
  • the microprocessor then generates a different code which is transmitted by the unit 13 to signal that the detector unit requires recharging.
  • the portable receiver unit 20 incorporates an on/off switch 21 and a receiving aerial 22, which although shown externally will normally be internal to the case 23.
  • the unit may be provided with a mounting clip (not shown) and houses a radio receiver 30 as shown in Fig. 4.
  • the receiver unit electronics are powered from a conventional battery supply 31 so that there is no need for frequent recharging.
  • a microprocessor-based code detector 32 interprets the code and operates an alarm device 33 to signal either that the nappy is wet or that the detector charge is low. Different coloured LEDs could be used to indicate the two different alarm conditions. Both states are signalled to the mother by a beeper that continues to sound until the receiver unit is switched off.
  • the detector unit 1 When removed from the nappy the detector unit 1 may be recharged by placing the electrodes 3 and 4 against two contacts 40 and 41 of a mains-powered charging unit 42, shown in Fig. 5.
  • the detector may be held in a cradle, rather like a mobile phone charger.
  • an LED 43 on the charger unit illuminates to confirm that a good electrical contact exists.
  • the capacitor may be arranged to receive power via a rectifier so that should the detector unit be connected the wrong way round no harm will result, but the capacitor will not charge and the LED will not illuminate. After about 30 seconds, when the capacitor reaches full charge (about 5 volts), the LED fades to indicate that the detector is ready for use.
  • a preferred arrangement is to charge the capacitor by inductive coupling with the charger whereby an alternating current is induced in an electromagnetic coil 80 within the housing 2 (Fig. 2) and is rectified by diode 81 to charge the capacitor 10. This eliminates the need for a physical connection with the charger. Again, charging is very rapid.
  • the detector unit 1 should be wiped clean with a damp cloth or tissue before being re-used.
  • the modified detector unit 1 shown in Fig. 6 again has a soft encapsulating sealed moisture-proof outer case 2 which encloses the electronic circuitry.
  • the electrodes 3 and 4 are replaced by a two-pin connector 50 to which a mating connector 51 can be attached.
  • the connector 51 is joined by a twin insulated wire 52 to a remote moisture sensor 53 which, by way of example, could comprise a pair of closely disposed tracks carried on the surface of an insulating plate.
  • This form of the detector unit 1 can be mounted outside the nappy within the baby's clothing or tucked inside the waist band of the nappy.
  • the sensor 53 is inserted into the nappy in contact with the moisture-absorbing material so that when the nappy becomes wet with urine a signal is sent to the electronics to trigger an alarm as described above.
  • the remote sensor has the advantage that the unit 1 is not in direct contact with urine and therefore requires less frequent cleaning.
  • the sensor 53 is simply uncoupled at the connectors 50/51 and sterilised or discarded.
  • the capacitor power source within the unit 1 can be recharged via the connector 50 or preferably by inductive coupling as described above.
  • the detector unit which is shown in Fig.s 7 and 8 allows this to be achieved in an inexpensive but very effective manner.
  • the unit 1 again includes a soft moisture-proof case 2 which encloses the electronic circuitry. In place of the two-pin connector 50 there are two electrical contacts 60 mounted on opposite sides of the case 2. The unit 1 is inserted into a disposable pocket 61 which has an integral sensing tail 62.
  • the pocket 61 and tail 62 are formed from a strip 65 of strong moisture-absorbent tissue paper like material having enlarged areas 63 and 64 at opposite ends to form the pocket 61.
  • an electrically-conductive layer is deposited by a printing process using an electrically-conductive carbon-containing ink.
  • a contact area 67, 68 is deposited in the centre of each area 63 and 64 with respective conductive tracks 69 and 70 which end mid-way along the strip.
  • the tracks 69 and 70 are not mutually joined and are offset towards opposite edges of the strip so that when the strip is folded along a centre line 71 the two tracks still do not make electrical contact along the tail 62.
  • the two superimposed halves of the strip 65 are secured together by an adhesive 73 which extends along the strip and around the periphery of each end area 63, 64.
  • the top of the pocket 61 remains open so that the detector unit 1 can be inserted, whereupon the contacts 60 make electrical contact with the conductive areas 67 and 68.
  • a flap 76 can be formed by an extended part of the enlarged area 64, which may be folded over and secured to the outer surface of the area 63 by means of a pressure-sensitive adhesive 77.
  • the adhesive 77 can conveniently be protected by a peelable backing sheet (not shown) prior to use.
  • the pocket 61 containing the detector unit can be mounted outside the nappy within the baby's clothing or tucked inside the waist band of the nappy.
  • the sensing tail 62 is inserted into the nappy so that when the tissue-paper-like material becomes wet with urine the electrical resistance between the tracks 68 and 69 is reduced and a signal is sent to the electronics to trigger an alarm, as already described.
  • the case 2 is removed from the pocket 61 which is discarded with the attached sensing tail 62.
  • the case 2 can be recharged and sterilised if necessary and replaced into a fresh pocket 61 for re-use.
  • the moisture detector has a wider application.
  • the detector could be used by incontinent adults or bed wetters.
  • the detector unit can be used to sense other kinds of moisture other than urine.

Landscapes

  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Vascular Medicine (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Orthopedics, Nursing, And Contraception (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Claims (8)

  1. Feuchtigkeitsdetektor, der eine Detektoreinheit (1) mit einem flüssigkeitsundurchlässigen Gehäuse (2) und mit einer Kondensatoreinrichtung (10) zum Speichern elektrischer Ladung zur Leistungsversorgung der Detektoreinheit, eine Feuchtigkeitssensoreinrichtung (3, 4; 53; 65), die ein Paar von Feuchtigkeitssensorelektroden (3, 4; 69, 70) enthält, und eine entfernte Alarmeinrichtung (20) aufweist, die von der Detektoreinheit über eine drahtlose Verbindung betreibbar ist, wenn Feuchtigkeit an den Feuchtigkeitssensorelektroden vorhanden ist,
    gekennzeichnet durch
    eine von der Detektoreinheit und der Feuchtigkeitssensoreinrichtung getrennte Ladeeinheit (42), um der Kondensatoreinrichtung (10) elektrische Ladung zuzuführen.
  2. Feuchtigkeitsdetektor nach Anspruch 1, bei dem die Feuchtigkeitssensorelektroden eine elektrisch leitfähige Tinte (69, 70) aufweisen, die auf einem flexiblen, Feuchtigkeit absorbierenden Streifen (65) aufgebracht ist.
  3. Feuchtigkeitsdetektor nach Anspruch 2, bei dem der Feuchtigkeit absorbierende Streifen zwei gegenüberliegende Feuchtigkeit absorbierende Schichten aufweist, wobei Tinte auf die einander gegenüberliegenden Seiten der beiden Schichten aufgebracht ist.
  4. Feuchtigkeitsdetektor nach Anspruch 3, bei dem der Feuchtigkeit absorbierende Streifen ein einzelnes Längenstück eines Feuchtigkeit absorierenden Materials umfaßt, das doppelt gefaltet ist, um die beiden Schichten zu bilden.
  5. Feuchtigkeitsdetektor nach Anspruch 3 oder 4, bei dem die beiden Schichten eine Tasche (61) zur Aufnahme der Detektoreinheit bilden.
  6. Feuchtigkeitsdetektor nach Anspruch 5, bei dem die Detektoreinheit elektrisch mit den Feuchtigkeitssensorelektroden über Bereiche elektrisch leitfähiger Tinte (67, 68) verbunden ist, die an der Innenseite der Tasche aufgebracht ist.
  7. Feuchtigkeitsdetektor nach einem der vorhergehenden Ansprüche, bei dem die Detektoreinheit und die Ladeeinheit eine gegenseitig induktive Kopplungseinrichtung (80), um der Kondensatoreinrichtung elektrische Ladung zuzuführen, umfassen.
  8. Feuchtigkeitsdetektor nach einem der vorhergehenden Ansprüche, bei dem die Detektoreinheit (1) eine Ladeüberwachungsschaltung umfaßt und ein kodiertes Signal sendet, wenn die Kondensatoreinrichtung eine Wiederaufladung benötigt, wobei das Signal die entfernte Alarmeinrichtung (20) veranlaßt, eine Warnung für niedrige Ladung zu geben.
EP99955355A 1998-06-03 1999-05-28 Feuchtigkeitssensor Expired - Lifetime EP1082711B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GBGB9811779.9A GB9811779D0 (en) 1998-06-03 1998-06-03 Moisture detector
GB9811779 1998-06-03
GBGB9818164.7A GB9818164D0 (en) 1998-06-03 1998-08-21 Moisture detector
GB9818164 1998-08-21
PCT/GB1999/001710 WO1999063497A1 (en) 1998-06-03 1999-05-28 Moisture detector

Publications (2)

Publication Number Publication Date
EP1082711A1 EP1082711A1 (de) 2001-03-14
EP1082711B1 true EP1082711B1 (de) 2002-08-28

Family

ID=26313779

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99955355A Expired - Lifetime EP1082711B1 (de) 1998-06-03 1999-05-28 Feuchtigkeitssensor

Country Status (6)

Country Link
US (1) US6373395B1 (de)
EP (1) EP1082711B1 (de)
AT (1) ATE223098T1 (de)
AU (1) AU4274299A (de)
DE (1) DE69902660T2 (de)
WO (1) WO1999063497A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI405561B (zh) * 2006-06-29 2013-08-21 Uni Charm Corp 排泄物檢測感應器

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TWI405561B (zh) * 2006-06-29 2013-08-21 Uni Charm Corp 排泄物檢測感應器

Also Published As

Publication number Publication date
US6373395B1 (en) 2002-04-16
AU4274299A (en) 1999-12-20
EP1082711A1 (de) 2001-03-14
DE69902660T2 (de) 2003-04-24
WO1999063497A1 (en) 1999-12-09
DE69902660D1 (de) 2002-10-02
ATE223098T1 (de) 2002-09-15

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